1. Celine Dion. The GRAMMY winner will receive the ICON award and perform the first single that she's released since her husband Rene Angelil died, "The Show Must Go On" -- a cover of Queen's 1991 classic.

2. Kesha. Dr. Luke's Kemosabe record label has given its permission for the 29-year-old singer to perform at the awards show after previously rescinding their approval over concerns that she would use the platform to disparage the music producer. The cancellation controversy came after Kesha's sexual assault case against Dr. Luke (real name Lukasz Gottwald) was put on hold while she resolves her breach of contract lawsuit. Kesha alleges Dr. Luke drugged and raped her in the suit -- claims the producer has dismissed as "outright lies."

3. Justin Bieber. Will the 22-year-old pop star be a diva? The BBMAs come just after the Purpose artist delivered an Instagram rant, airing his frustrations with fans who ask him for photos on the street.

"If you happen to see me out somewhere know that I'm not gonna take a picture. I'm done taking pictures," he wrote. "It has gotten to the point that people won't even say hi to me or recognize me as a human. I feel like a zoo animal, and I wanna be able to to keep my sanity."

4. Gwen Stefani. The No Doubt frontwoman posted a video to Snapchat of herself rehearsing with her adorable 2-year-old son, Apollo, but on Sunday night, the toddler will be replaced with Stefani's new beau, Blake Shelton. The two are set to perform their duet, "Go Ahead and Break My Heart."